RE: Missing duration equality

Michael:
I realize that equality does not require a total order.  The feeling in
the WG was that duration, lacking a total order, was not a useful
datatype and  we should not provide operations on it.  Thus, we provided
operations on only the 2 totally ordered subtypes of durations that we
defined.

Recently, there has been a proposal to change the value space of
duration to a tuple (integer minutes; decimal seconds}.  If this
proposal is accepted we may revisit this issue and, who knows, perhaps
define an equality operator on xs:duration. 

All the best, Ashok
> -----Original Message-----
> From: Michael Brundage [mailto:xquery@comcast.net]
> Sent: Friday, July 04, 2003 11:55 AM
> To: Ashok Malhotra; public-qt-comments@w3.org
> Subject: RE: Missing duration equality
> 
> Ashok, equality does not require a total ordering.  Only gt/ge/lt/le
> require
> an ordering.
> 
> Also you've already defined eq and ne for every other type (or
supertype),
> including those that are not totally ordered.  (For example, xs:QName
and
> xs:NOTATION.)  xs:duration is the only type omitted.
> 
> 
> Thanks,
> michael
> 
> 
> -----Original Message-----
> From: Ashok Malhotra [mailto:ashokma@microsoft.com]
> Sent: Tuesday, July 01, 2003 9:09 AM
> To: Michael Brundage; public-qt-comments@w3.org
> Subject: RE: Missing duration equality
> 
> 
> That's deliberate!  Equality is not defined on xs:duration because it
> has a partial order.  Equality is defined only on the two fully
ordered
> subtypes of xs:duration -- xdt:dayTimeDuration and
> xdt:yearMonthduration.
> 
> All the best, Ashok
> > -----Original Message-----
> > From: public-qt-comments-request@w3.org [mailto:public-qt-comments-
> > request@w3.org] On Behalf Of Michael Brundage
> > Sent: Tuesday, July 01, 2003 7:57 AM
> > To: public-qt-comments@w3.org
> > Subject: Missing duration equality
> >
> >
> > May 2, XQuery draft, section B.2 (Operator Mapping)
> >
> > The table is missing entries for eq and ne applied to the
xs:duration
> > type.
> >
> >
> >
> >
> >
> > Michael Brundage
> > xquery@comcast.net
> >
> > Writing as
> > Author, "XQuery: The XML Query Language" (Addison-Wesley, to appear
> 2003)
> > Co-author, "Professional XML Databases" (Wrox Press, 2000)
> >
> > not as
> > Technical Lead
> > Common Query Runtime/XML Query Processing
> > WebData XML Team
> > Microsoft
> >
>

Received on Friday, 4 July 2003 17:02:38 UTC